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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c19a03374b61ced6eab4a3f2e3fb13e99ee0c41824ff305fd93dddfce8f704' 
  AND token = 'Pd2JTAchGopoBzk3LRmr1Pe60FHAVLJtyHZhXVTFj8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}